import std.process;
import std.stdio;
import std.exception;

void main()
{
    // For our example we'll exec `ls`. D doesn't require an
    // absolute path to the binary we want to execute, but
    // we'll use `findExecutable` to locate it anyway.
    auto binary = findExecutable("ls");
    enforce(binary, "Could not find 'ls' executable");

    // `spawnProcess` requires arguments in array form.
    // We'll give `ls` a few common arguments. Note that the
    // first argument should be the program name.
    string[] args = ["ls", "-a", "-l", "-h"];

    // `spawnProcess` also needs a set of environment variables
    // to use. Here we just provide our current environment.
    auto env = environment.toAA();

    // Here's the actual `spawnProcess` call. If this call is
    // successful, the execution of our process will end
    // here and be replaced by the `ls -a -l -h` process.
    // If there is an error we'll get an exception.
    try
    {
        auto pid = spawnProcess(args, env);
        wait(pid);
    }
    catch (Exception e)
    {
        writeln("Error executing process: ", e.msg);
    }
}